1 files changed, 93 insertions, 0 deletions
diff --git a/lib/scripts/tree.js b/lib/scripts/tree.js
new file mode 100644
index 000000000..96763053d
--- /dev/null
+++ b/lib/scripts/tree.js
@@ -0,0 +1,93 @@
+jQuery.fn.dw_tree = function(overrides) {
+    var dw_tree = {
+
+        /**
+         * Delay in ms before showing the throbber.
+         * Used to skip the throbber for fast AJAX calls.
+         */
+        throbber_delay: 500,
+
+        $obj: this,
+
+        toggle_selector: 'a.idx_dir',
+
+        init: function () {
+            this.$obj.delegate(this.toggle_selector, 'click', this,
+                               this.toggle);
+        },
+
+        /**
+         * Open or close a subtree using AJAX
+         * The contents of subtrees are "cached" until the page is reloaded.
+         * A "loading" indicator is shown only when the AJAX call is slow.
+         *
+         * @author Andreas Gohr <andi@splitbrain.org>
+         * @author Ben Coburn <btcoburn@silicodon.net>
+         * @author Pierre Spring <pierre.spring@caillou.ch>
+         */
+        toggle: function (e) {
+            var $listitem, $sublist, timeout, $clicky, show_sublist, dw_tree, opening;
+
+            e.preventDefault();
+
+            dw_tree = e.data;
+            $clicky = jQuery(this);
+            $listitem = $clicky.closest('li');
+            $sublist = $listitem.find('ul').first();
+            opening = $listitem.hasClass('closed');
+            $listitem.toggleClass('open closed');
+            dw_tree.toggle_display($clicky, opening);
+
+            // if already open, close by hiding the sublist
+            if (!opening) {
+                $sublist.dw_hide();
+                return;
+            }
+
+            show_sublist = function (data) {
+                $sublist.hide();
+                if (typeof data !== 'undefined') {
+                    $sublist.html(data);
+                }
+                if ($listitem.hasClass('open')) {
+                    // Only show if user didn’t close the list since starting
+                    // to load the content
+                    $sublist.dw_show();
+                }
+            };
+
+            // just show if already loaded
+            if ($sublist.length > 0) {
+                show_sublist();
+                return;
+            }
+
+            //prepare the new ul
+            $sublist = jQuery('<ul class="idx"/>');
+            $listitem.append($sublist);
+
+            timeout = window.setTimeout(
+                bind(show_sublist, '<li><img src="' + DOKU_BASE + 'lib/images/throbber.gif" alt="loading..." title="loading..." /></li>'), dw_tree.throbber_delay);
+
+            dw_tree.load_data(function (data) {
+                                  window.clearTimeout(timeout);
+                                  show_sublist(data);
+                              }, $clicky);
+        },
+
+        toggle_display: function ($clicky, opening) {
+        },
+
+        load_data: function (show_data, $clicky) {
+            show_data();
+        }
+    };
+
+    jQuery.extend(dw_tree, overrides);
+
+    if (!overrides.deferInit) {
+        dw_tree.init();
+    }
+
+    return dw_tree;
+};